EP 0349947 B1 19931208 - Diffraction optics diffusing screen laminate for full color on-axis viewing.
Title (en)
Diffraction optics diffusing screen laminate for full color on-axis viewing.
Title (de)
Beugungsoptisches Streuschirmlaminat für vollfarbfähige Axialbetrachtung.
Title (fr)
Ecran diffuseur laminaire à optique de diffraction pour l'observation axiale en couleur.
Publication
Application
Priority
US 21498688 A 19880705
Abstract (en)
[origin: EP0349947A2] An optical screen module (20) for full-color, on-axis viewing is described. The module has a transmission holographic optical element (25), a louver filter (30), and a diffraction optics diffusion screen (35). Input light (14) is diffracted off-axis by the transmission holographic element (25), passed through the louver filter (30) and rediffracted on-axis by the diffusion screen (35). The module (20) can handle full-color light because the dispersion in the transmission hologram is compensated by that in the diffusion screen (35). The louver filter (30) blocks the undiffracted zero-order light (16) while allowing the light (21, 22, 23) diffracted by the transmission hologram (25) to pass through (Fig. 2).
IPC 1-7
IPC 8 full level
G03B 21/62 (2006.01); G02B 5/00 (2006.01); G02B 5/32 (2006.01); G03H 1/02 (2006.01); G09F 9/00 (2006.01)
CPC (source: EP US)
G02B 5/00 (2013.01 - EP US); G02B 5/32 (2013.01 - EP US); G03H 1/2249 (2013.01 - EP US); G03H 1/0256 (2013.01 - EP US); G03H 1/2205 (2013.01 - EP US); G03H 1/24 (2013.01 - EP US); G03H 2001/2234 (2013.01 - EP US); G03H 2001/2263 (2013.01 - EP US); G03H 2001/2265 (2013.01 - EP US); G03H 2001/264 (2013.01 - EP US); G03H 2223/12 (2013.01 - EP US); G03H 2260/10 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0349947 A2 19900110; EP 0349947 A3 19900801; EP 0349947 B1 19931208; CA 1320366 C 19930720; DE 68911218 D1 19940120; DE 68911218 T2 19940707; DK 170006 B1 19950424; DK 331089 A 19900106; DK 331089 D0 19890704; ES 2014171 A6 19900616; IL 90478 A0 19900118; IL 90478 A 19920818; JP H0277737 A 19900316; US 4960314 A 19901002
DOCDB simple family (application)
EP 89112073 A 19890701; CA 604210 A 19890628; DE 68911218 T 19890701; DK 331089 A 19890704; ES 8902361 A 19890704; IL 9047889 A 19890531; JP 17385489 A 19890705; US 21498688 A 19880705